avstream driver in Audio Capture Sources?

Is there any way to register a virtaul avstream audio driver in the category of Audio Capture Sources? I searched online, and some posts said there is no way to do that. Only way is to write a PortCls audio driver. Is this correct? The background is that I wrote an avstream audio virtual driver it only can be seen in the category WDM Capture streaming. The application needs this driver showing up in Audio Capture Sources. Thanks for your help.

Yong